Ore-crusher.



N0. 68|,234. Patented Aug. 27, |90l.

c. H. & H. c; KnAusE. OBE CRUSHER.

(Application med um. 11, 1901.) (No Model.)

" www i t l w 3N UNITED STATES PATENT EEICE.

i p CHARLES I-I. KRAUSE,DOF SOUTHLAKE LINDEN, AND HENRY C. KRAUSE,

OF POINT MILLS, MICHIGAN.

ORE-CRUSHER.

SPECIFICATION forming part of Letters Patent No. 681,234, dated August27, 1901..

" Application tied March 11, 1901. serai No. 50,624. on model.)

To @ZZ whom `it may conservar p Beit known that we, CHARLES H. KRAUsE,residing at Southlake Linden, and HENRY C. KRAUSE, residing-atPointMills, in the county y 5 of Houghton and State of Michigan, citizens ofthe United States, have invented certain `new and useful Improvements inOre-Crush- Y ers, of which the following is aspeciiication, referencebeing had to` the accompanying lo drawing, forming a part thereof.

Our invention Vrelates particularly to that class of ore-Crushers inwhich the crushed "ore` when it is reduced to the desired size is p.discharged by the splash of water through screens.

y i `The main objects of the invention are to` Y remove pieces offreemetal which are too large to pass through the screens in theordinaryway, to reduce the loss of metalin 1"1 ,20,.1 slimes andtailings, to increase the capacity p of mills of this class, and toavoid accidents andinjury tosuch mills by reason lof the ac- 1cumulation therein of large pieces of free f metal.

2"51, p Theinvention consists in certain novel feai E tures in theconstruction and arrangement of "E 1.31 parts and` in the combinationsof parts here` "inafter particularly described, and pointed i f outinthe claims.`

p For the purpose of illustrationwe have shown the invention inconnection with a i 1 1 stamp-mill particularly designed for crushing`copper ore or copper-bearing rock; but it is 139 y y applicable toother kinds of stamp-mills and Q "fore-crushersof the class abovementioned p and maybe used for crushing other kinds of u ore ormetal-bearing rock.

`The accompanying drawing shows the devicein connection with such astamp-mill in i p 4o vertical section. l

A is themortar, B the stamp, and C the f v j screen surrounding thecavity in the mortar of a single-stamp mill such as are used forcrushing copper-bearing rock in the Lake l ff`Superior copper region,

The mortar is prozvided with a hardened die and stave-liners,fthestainp.` is provided with a hardened shoe, p. and thescreenis'surrounded by a splash-pan or deflector D, by which the pulp orcrushed` 5o ore is deiectedl after passing through the screen downwardlyinto a channel a, formed in` the mortar around the central cavitytherein. Stamps of this kind for crushing copper ore or copper-bearingrock of the character above mentioned are made to strike a powerful blowand crush a large quantity of the ore or rock in a given time. The oreor rock is fed with water into the mill through an opening in the roofaround the stamp- 'z shaft, and as it is crushed by the powerful blowsof the stamp against the die in the mortar it is thrown violently in alldirections against the screen.

For the sake of economy in the operation` of the mill and in the productit is desirable `to crush the ore or rock only enough to free the metalwhich it contains and to discharge it from the mortar as soon as it issufficiently crushed. Much of the copper-bearing ore or rock obtained inthe Lake Superior region contains metal in large flakes or pieces, manyof which are too large to pass through the meshes or openings in thescreen. These large flakes or pieces of metal, if allowed to accumulatein the mortar, not only interfere with the operation of the mill andreduce its capacity, but are rapidly abraded by the repeated powerfulblows of the stamp. This ,i resultsin a large increase in the quantityof fine pulp or slimes produced by the mill and a corresponding loss inthe tailings. To avoid these difticulties and objections, we provide themill with a discharge for removing from theV mortar as soon as they areseparated from the rock the iakes or chunks of metal that are too largeto pass through the screen (l. This discharge, as applied to asingle-stamp mill of the kind shown in the drawing, consists of adescending conduit or passage E, leading out through one side of themortar and connected at its outer end bya pipe F with a pump, elevatedtank, or other water-supply arranged to produce through the passage Einto the mortar an upward current of water of sufticient force to holdback rock and sand, `while the heavier pieces of metal are allowed `t0descend by gravity against the inilowing current and escape from themortar through said passage. At its outer endthe passage E is continueddownwardly below the com roo into a recess provided therefor in one side0fsaidpipe, so as to afford. a free and unobstructed passage when it isopen for the discharge of the copper or other metal into the lower partof said pipe, which forms a trap Afor catching and holding a quantity ofmetal.

The valve His operated by means of a rod J, which is connected with anarm h on the stem or pivotpin of said valve, or it may be operated byany other suitable means. The valve I is constructed and arranged totightly close the lower end of the pipe G in order to avoid waste ofwater and admit of a continuous operation of t-he stamp-mill and of thedischarge device. The lower end of the pipe G is preferably facedobliquely to its axis to form a seat for the valve I, which may bepivotally connected with said pipe at a distance from its end bytwo'links, one on each side, as indicated by dotted lines in thedrawing. These links may be extended to form h-andles i for operatingsaid valve, which is drawn tightly against its seat on the end of thepipe when it is closed, as shown in the drawing.

K is a rod movable endwise through astufting-box 7c on the outer side ofthe pipe G in line with the passage E. It serves to clear said passagein case it becomes clogged or large pieces of metal lodge atvits upperend.

The injection-pipe F is provided at any convenient point therein with avalve or other means (not shown) for regulating or shutting olf the flowof water through the dischargeconduit.`

The device operates as follows: Normally the upper valve H in the pipe Gis open, lthe valve I is closed, and the rod K is withdrawn from thedischarge-passage and stands in the position shown in the drawing. Underthese conditions when the stamp-mill is in operation water is suppliedthrough the pipe F and its iiow through the passage E into the mortar isregulated so that the force of the current will hold back rock and sandin the mortar, but will allow the heavier pieces of metal to descendthrough said passage and drop into the lower end of the pipe G, whichserves as a trap -for catching and holding a certain quantity of metaland preventing waste of water. The metal caught and held in the pipe Gis discharged from time to time into a box L or other suitablereceptacle by irst closing the valve H and then opening the valve I.After the metal has been thus discharged from the pipe G the valve I isclosed this arrangement and manipulation of the valves H and I theoperation of the stampmill and of the discharge device is notinterrupted, and little or no water is wasted. In case the passage Ebecomes clogged the rod K is thrust inwardly through'it, and theobstructionis thereby dislodgedand removed.

One of the stave-liners next tothe inner end of the passage E is formedwith an o'utwardly-flaring hole e, as shown inthe drawing. The shape ofthis hole has been found in practice to be essential to the mostefficient and satisfactory operation of the device.

It is obvious that any stamp-mill or orecrusher to which our auxiliarydischarge for free metal is applicable may be provided, ac-Y cording tothe requirements of the case, with one or more of the devices,substantially as herein shown and described.

Various changes in the details of construction and arrangement of partsin adapting our discharge device to dierent kinds of stampvmills orore-Crushers for use under various conditions upon different kinds offore and metal-bearing rock may be made without departing from theprinciple and intended scope of our invention.

We claiml. In an ore-crusher the combination with a stamp and mortar forcrushing the ore and a screen through which the crushed ore isdislcharged by the splash from the stamp, of au auxiliary discharge forfree metal too large to pass through the screen, consisting of a conduit leading downwardly out of said mortar and a water-supply connectionleading into said conduit and adapted to produce an upi ia screenthrough which the crushed ore is discharged by the splash from thestamp, of

an auxiliary discharge for free metal too` large to pass through thescreen, consisting ot' a conduit leading out of said mortar inside ofthe screen, an injector connection for forc= ing water through saidconduit into said refceptacle, and a valverfor closing said conduitbelow the injector connection, substantially las described. 3. In anore-crusher, the combination with Vthe receptacle in which ore iscrushed, of a fdescending discharge-conduit leading out of saidreceptacle and provided with a trap at .its lower end, and awater-injection connec-V ltion with said conduit above said trap,substantially as described.

4t. In an ore-crusher, the combination with the receptacle in which oreis crushed, of a descending discharge-conduitl leading out of saidreceptacle and provided with two valves for closing a portion of thelower part of said `conduit and a water-supply connection leading intosaid conduit above said valves, subfstantially as described. and thevalve II is opened. By means of 5. In-an ore-Crusher, the combinationwith -lthe receptacle in which ore is crushed, of a descendingdischarge-conduit leading out of conduit above said valve, and a rodmovable IOO u fo aportion of said conduit, and a Water- Id above saidValves `and arranged to produce y duit for clearing the same,substantially as ing the mortar, of a descending dischargei conduitleading out of the mortar and proaxially through the upper part of saidconl-an upward current of Water through said conduit into said mortar,substantially as dedescribed. scribed.

6. In an orefcrusher, the combination with In Witness whereof we heretoaffix our siga stamp and mortar, and a screen surroundg natures inpresence of two W1tnesses` CHARLES H. KRAUSE.

vided Withvalves which are arranged to cut HENRY C' KRAUSE" Witnesses:

THOMAS H. HARRIS, JOSEPH PRYOR.

supply connection leading into said conduit

